<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../VueJs/vue.js"></script>
</head>

<body>

    <div id="root">
        姓：<input type="text" v-model="firstName"><br>
        名：<input type="text" v-model="lastName"><br>
        姓名：<span>{{fullName}}</span>
    </div>
</body>
<script>
    Vue.config.productionTip = false;
    Vue.config.devtools = true;

    const vm = new Vue({
        el: '#root',
        data: {
            firstName: "张",
            lastName: '三',
        },
        computed: {
            //完整写法
            /* fullName: {
                get() {
                    console.log(this);
                    return `${this.firstName}-${this.lastName}`;
                },
                set(value) {
                    const arr = value.split('-');
                    this.firstName = arr[0];
                    this.lastName = arr[1];
                }
            } */

            //确定计算属性只读不改可简写,fullName不用再写为配置对象，function当get用
            fullName: function () {
                console.log(this);
                return `${this.firstName}-${this.lastName}`;
            }
        }
    });
</script>

</html>